Flirting

Is my friends girlfriend flirting with me?

There's this couple that I met through a mutual friend and have since gotten to know relatively well. I don't consider either of them my closest friends and I've never had an especially honest or vulnerable conversation with them; I'm only around them when I'm around the friend I met them through, and have very seldom been alone with either of them, but I still consider them friends. Anyway, my friend's girlfriend is very friendly, a little too friendly. I recall, years ago, seeing her dancing provocatively in a friend's house and she didn't stop when she saw me walk in. She's also told me I look cute different times before, randomly slaps my butt, laid her head on my shoulder one time, asks me for back massages, touches me and teases me often. One time, at work, we were both walking in opposite directions and nearly bumped into each other. When this happens, our faces got really close to each other and our lips nearly touched. I know how that sounds, but it really was just a clumsy accident. But the look on her face afterward was interesting. She, for once, was speechless, and just kind of stared at me with this big smile and gleam in her eyes. There were also two times when I accidentally walked in on her undressed, but I quickly backed out of the room before I could clearly see anything. One time, she told me to seat her (I'm a host a restaurant and she's a waitress) and I pointed out that I had already sat her twice pretty recently. Then she said "I want more", then I said "I'm gonna give you more" and she replied "That sounded dirty" in very schoolgirl-like giggly voice. She also gets along with me way better than our mutual friend, while they've often quarreled, she's always been extra-friendly to me. I've never known what to make out of her behavior, I can't tell if she just has a friendly personality, or if she secretly wants me.
Is my friends girlfriend flirting with me?
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